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Protected MOSFET Bleeder

Publishing Venue

The IP.com Prior Art Database

Related People

Bob Lazaravich: INVENTOR

Abstract

The present embodiments enable the use of a protected MOSFET for the bleeder instead of a switch (transistor or MOSFET) and a resistor. Protected MOSFETs are commercially available devices which include some level of self-protection.

Country

United States

Language

English (United States)

This text was extracted from a Microsoft Word document.

This is the abbreviated version, containing approximately
62% of the total text.

Protected MOSFET Bleeder

By:
Bob Lazaravich

A
small module that has a number of power supply bleeder circuits in it. In one embodiment 4 – 8 power bleeder
circuits are comprised within the module.

It is well known to use bleeders in
modern digital logic to get the power supplies to go all the way down to 0V
when power is removed. In the old days
you did this to remove lethal voltages. Nowadays
we do this to make sure that a power supply output starts at 0V instead of say
.7 or .8V or higher. Often times without
a bleeder it can take minutes for the voltage to bleed off.

We want the power supplies to start
at zero for 2 reasons.

1.
To make sure that we can sequence designs with multiple power
supplies correctly. You need to start at 0V to do this.

2.
We want to be sure that logic devices including initialization
circuits actually run the initialization process. Sometimes if the power
turns on and the power supply output voltage is above some threshold (from the
last power cycle) the devices will skip initialization.

The present embodiments enable the
use of a protected MOSFET for the bleeder instead of a switch (transistor or mosfet) and a resistor. Protected MOSFETs are commercially available
devices which include some level of self-protection. The self-protection may include current
limiting, temperature limiting, ESD (electrostatic discharge) protection or a
current mirror.